Hand sander



Dec- 1949 T. R. STIENBERG ET AL 2,492,602

HAND SANDER 2 Shefs-Sheet 1 Filed Nov. 8, 1948 I r n 8 r 2 J 3% mnh flmw n fi wdm y; mF

v 1366- 1 T. R. STENBERG ET AL 7 2,492,602

HAND SANDER Filed Nov. 8, 1948 2 Sheets-Sheet 2 lfnvpni'ors:

morniunwqnbpr g, Fned 7! Jf cng Patented Dec. 27, 1949 Thornton R.Stenberg, Troy, Fred '1. King, Larchmont, and Milton Immermann,Piermont, N. Y., assignors to Behr-Manning Corporation, Troy, N. Y., acorporation of Massachusetts Application November 8, 1948, Serial No.58,978

13 Claims.

The present invention relates to an abrasive implement of the type inwhich a strip of coated abrasive, such as sandpaper, abrasive cloth, and

prise some sort of body or block, with means for clamping an abrasivestrip against the working surface thereof. Many include a chamber orreceptacle for a reserve supply of abrasive strip material in coiledform. Since such. devices are 1 well understood in the art, a furtherdescription of their use and advantages is unnecessary.

The primary object of the present invention is to simplify theconstruction of hand sanders, to

the end that they may be produced at a minimun; in

cost, without sacrificing any of the essential or desirable featuresthereof. V

A further object of the invention is to provide an improved andsimplified mechanism for clamping and tensioning a coated abrasive stripin operative relation upon the body or block of a hand sander.

Another object is to provide an improved body or block constructionproviding an improved receptacle or chamber for a reserve supply ofabrasive strip material. 7

Another object is to provide a body or block which cooperates with theclamping and tensioning mechanism in an improved manner so that thelatter mechanism performs the additional function of closing and openingthe chamber for the reserve supply of strip.

Incarrying out the objects of the invention, anextremely simple devicehas been provided, consisting essentially of only three parts,constructed and arranged to perform the necessary functions of priordevices, all of' which have been more complicated and expensive tomanufacture.

In the accompanying drawings, certain illus trative embodiments of theinvention are shown, in which:

Figure 1 is a side elevation of a hand sander;

Figure 2 is a vertical, longitudinal section substantially through thecenter of Figure 1;

Figure 3 is a front elevation of Figure 1, looking toward the left endthereof;

Figure 4 is a rear elevation of the device of Figure 1, looking towardthe right end thereof;

' Figure 5 is a plan View} Figure 6 is a view similarto'Figure 1, withthe abrasive strip removed and :with the tensioning 2 and clampingmechanism in the inoperative position;

Figure 7 is a side elevation of the body or block, with the clamping andtensioning mechanism removed;

Figure 8 is a perspective View of a form of primary locking yoke, and

Figure 9 is a fragmentary elevation of a modified form of block.

In the drawings, the body block Ill is indicated as made of a single,solid piece of suitable material, such as wood, cast metal, plastic orthe like, but it must be understood that the block may, if desired, befabricated from a plurality of pieces, particularly if made of moldedplastic, as will be Well understood by those skilled in the plasticmolding art. The block or body includes a plane bottom surface II, a'somewhat rounded and forwardly and downwardly pitched top wall surface[2, a rear end wall I3, a front end wall l4, and side walls I5 and H5.The top wall adjacent the forward end is shaped to provide asubstantially vertical channel l7, while the rear end wall is alsoprovided with a horizontal, transverse channel Hi.

The body has formed therein a chamber 20 of substantial size openingthrough the side walls l5 and I6, and communicating with the rear endwall l3 through a slot 21, above the channel l8 therein.

The side walls of the block may be relieved as at 22 or 23 to providefinger grip recesses adjacentthe bottom wall ll. Also, the side wallsmay be provided with generally V-shaped recesses 24, 25 adjacent the.top surface 12, for a purpose hereinafter explained.

The chamber '20 constitutes a receptacle for a reserve supply of coatedabrasive strip in coil form as indicated at 26 in Figures 1 and 2. The

7 preferred free end of the strip is adapted to be threaded through theslot 2|, bent downwardly over the end face l3, led forwardly under thebottom H, upwardly over the front face l4 and rearwardly over a portionof the top surface I2, beyond the channel ll.

Preferably the bottom surface ll of the block is provided with a layerof substantial thickness of rubber or similar resilient material, asindicated at 28, to provide a semi-soft backing for the abrasivestripand to enable the abrasive surface to conform somewhat to the work.

The means for tensiom'ng and clamping the abrasive strip in'placecomprises a double link toggle, including a pair of yokes, one pivotedto the block and the other to the first yoke, so'

that the swinging movement of one yoke to looking position draws theother yoke into locking position and moves the toggle links past deadcenter, to maintain the assembly in locked position. In the embodimentillustrated, the first yoke 30 includes a pair of parallel, sheet metallegs 3| and 32, interconnected by an integral transversely bent,blade-like head 33. The legs are pivotally connected to the side facesof the body by pins 34, 35 or the like and are provided with rearwardlyand downwardly projecting, plate extensions 36, 31 which serve asclosures for the open ends of the chamber 20 when the parts are in theposition shown in Figures 1-5.

The second link 40 of the toggle mechanism may comprise a relativelystiff spring wire yoke or bail, including legs 4! and 42, having theirfree ends hooked through appropriate openings in and pivotally connectedto the legs 3'! and 32 of the first yoke, as indicated at 43 and 44, atpoints spaced forwardly of the fulcrum constitutedby pins -34'a'nd '35.The recesses '24 and 25 accommodate the bent ends 43 and 44 of wire yokein the downward movement'thereof, as indicated in Figure '5. The legs 4|and 42'a're interconnected at their rear ends. by an integraltransversely extending head portion 45, which may include angular endsections 4B"and .41 as indicated in Figures 4 and 5, to impartresiliency to the bail as a whole. For the same purpose,"the forwardends of the'le'gs' 4l,'42 maybe "forwardly and downwardly curved asindicated at 48.

When theprimary toggle link or yoke 30 is swung forwardly and'downwardlyfrom the position shown in Figurefiftheblade-like head 33thereof'enters the channel T7 in the top surface. If a coated abrasivestrip has previously been laid over this channel, the head will forcethe same thereinto'and willapply tension to'the strip. 'The head ofthe-spring wire bail, positioned as indicated in'dotted lines in"1Figure'6, will be drawn forwardly-by the forward and downward swingingmovement of the 'yokef30, with the result that its hea'ddfi'enters' thechannel It? and clamps the coated abrasive strip "overlying saidchannel. The parts are so proportioned that, as the head 33 approachesthe channel H, in its forward and downward swinging movement, the head'45 of the other yoke'entersthe'channel i8 and clamps the strip therein.Tension 'maybe applied manually to the free end of the strip in arearward direction along the-topsurface [-2 of the block while the stripis thusclamped against the rear end face of the 'block. Continueddownward swinging movement of'the first yoke forces the head 33 thereofand the underlying-strip into the channel 11, thereby further tensioningand finally clamping the strip in place against the bottom surface ofthe resilient pad 28.

'Si'multanejouslywith the locking and clamping of the-strip, the ends 36and 31 of the yoke 30 swing upwardly and close the ends of the chamberor receptacle Ml for the coiled abrasive strip.

When the portion of the abrasive strip below the pad-2'8 has becomeworn, it-may be replenished by simply raising the yoke 30, therebyreleasing the head 31, from a channel" I! and the head 435 of the yoke40 from the channel l8. An appropriate length of-stripmay' thenbe'pulled outwardly through slot ZL wrapped downwardly over the endwalll3, forwardly under the bottom layer 28, and upwardly over the frontportion of the top-wall, beyond. channel 11. The yokes may then beshifted to theposition shown in Figure l toclarn-p thenew strip in placeand the worn end portion of the abrasive strip torn off and discarded.

The head 33 of the yoke may be provided with a forwardly and upwardlyprojecting extension 33', adapted to serve as a finger piece or rest forthe hand of the user so that, as pressure is applied to the implement atthe forward end thereof through the extension 33, the normal tendency isto maintain the toggle mechanism in locked position.

By reference to Figures 1 and 2, it should be noted that, when the partsare in the locked position, the toggles have swung past dead center. Inother words, the fulcrum of yoke 3!] (on the axes of pins 34and 35) ispositioned above a straight line drawn between the pivotal connections43 and 44 of the toggle link and the point of application'ofpressure bythe head 45. The yokes or toggle links in moving to their lockingposition are permittedfito swing past the dead center position by theresiliency of the yoke 40. Hence, they are maintained in the lockedposition by spring tension and-there is no tendency for the parts tobecome. released.

In themodification shown in Figure 9, the yoke 40 may be eliminated anda plate may be secured to the rear. end face of the block, adjacent theslot H". The plate has aplurality of teeth 5! which grip the abrasivestrip .bent sharply thereover, and prevent further uncoiling thereof. Inthis case, the leveryoke30 acts as previously described, to close theendsof the chamber 20 and toclamp the opposite endof the strip in thechannel formed in theupper surface of the block. Moreover,-.thetensionapplied to the-strip by the head 33' forces the strip downwardly.upon the gripping teeth 5,l and causes them to become embedded in thestrip.

The. forwardly. and upwardly projectingextension'33, serving asafingerpiece, as previously described, may be constituted byaseparatepiece, welded, riveted, or. otherwise secured tothe head 33, asin'dicate'din Figm esl, 2, and-6, or-may consist simply of anintegralextension ef the head'33, as indicated at 33" in Figure 8;

It should be understood that the invention is not limited to the.details-of construction and shape or proportion of parts-shown in theaccompanying drawings and described'above, but inclu'des all variationsand modifications :coming withinthe scope of theappended claims andtheir equivalents.

We claim:

1. A. hand sander comprising an elongated block shaped to provideazsubstantially planar bottom working surface-,npstanding side and endfaces-, and a top-surfacannaend face having a transverse channel and.the. top. face. having: a transverse channeladjacent the opposite .endthereon-and means for tensioningsand: clamping a coated abrasivestripinthe channels'and along said bottom; surface, comprisinga pair of.U shaped yokes, one; having its legs pivoted on. a fixed "axis,directly to the side faces of the body for swinging movement of its headinto one channel and the other yoke having its l egsapivoted tothe legsof the' first, yoke b'etween the fulcrum and the headthereof, the headofth'e: second yoke being positioned to bedrawn intottheother channel asthe head of the first; yoke isswung toward" and into said one channel.

2. A hand S5;I'IdB1{-"COmpllSing. 1 an: elongated block shaped toprovideaa'substantially planar bottom-workingsi-irface; upstanding sideand end faces, a. top surface a. receptacle for 1 i an abrasivestriphaving a delivery opening in one end face, said end face having atransverse channel below the delivery opening and the top face having atransverse channel adjacent the opposite end thereof, and means fortensioning and clamping a coated abrasive strip in the channels andalong said bottom surface, comprising a pair of U-shaped yokes, onehaving its legs pivoted on a fixed axis to the side faces of the body'for swinging movement of its head into one channel and the other yokehaving its legs pivoted to the legs of the first yoke between thefulcrum and the head thereof,.thehead of the second yoke beingpositioned to be drawn into the other channel as the head of the firstyoke is swung toward and into said one channel.

3. A hand sander comprising an elongated body shaped to provide bottom,top, side and end faces, said top face having a channel adjacent oneend, and the end face remote therefrom having a transverse channeltherein, said body having a chamber in the interior opening through saidend face above thechannel, whereby a strip of coated abrasive coiled inthe chamber may be drawn through theopening and wrapped around the blockover said channels and under the bottom working surface thereof, andmeans for tensioning and clamping the strip, comprising 'a pair ofU-shaped yokes, one pivoted on a fixed axis, directly to the side facesof the block for swinging movement of its head into one channel to forcethe strip thereinto, the other pivoted to the first yoke with its headpositioned to be drawn into the other channel by the pivoting movementof the first, to draw the strip thereinto.

4. A hand sander comprising a block having an interior chambercommunicating with an end face through a slot therein, said chamberconstituting a receptacle for a coiled abrasive strip adapted to bethreaded through the slot and wrapped downwardly over said end faceunder the bottom of the block and upwardly over a portion of the topface thereof, and means for tensioning and clamping the strip in saidposition, comprising a yoke having its legs disposed in parallelrelation to the side faces of the block and pivoted on a fixed axis,directly thereto and a head adapted to be swung downwardly onto thestrip disposed along the top face in clamping relation thereto, and asecond yoke having its ends pivoted directly to the legs of the firstmentioned yoke between the fulcrum and the head thereof, and having itshead positioned to be drawn against said end face in clamping relationto the strip, upon downward swinging movement of the first mentionedyoke.

5. A sander in accordance with claim 4 characterized in that the legs ofthe first yoke are extended on the opposite sides of the fulcrum fromthe head and constitute closures for the ends of said receptacle whenthe head thereof is swung downwardly.

6. A hand sander comprising a block having a horizontally disposed,transverse chamber therein opening through the side faces andcommunicating with one end face through a slot therein and constitutinga receptacle for a coiled coated abrasive. strip adapted to be threadedthrough the slot and wrapped downwardly over said end face, under thebottom of the block and upwardly over a portion of the top face thereof,said end face having a transverse channel below said slot and said topface having a channel adjacent the opposite end, and means fortensioning and clamping the strip in said position, comprising a sheetmetalyoke having its legs disposed in parallel relation to the sidefaces of the block and pivoted thereto on a fixed axis and a bladelikehead adapted to be swung downwardly into the channel in the top face,and a bail yoke having its ends pivoted directly to the legs of thefirst mentioned yoke between the fulcrum thereof and the head, andhaving its head positioned to be drawn into the end face slot upondownward swinging movement of the first mentioned yoke. 7. A hand sandercomprising a block having bottom, top, side, front, and rear end walls,the block being shaped to provide a transversely disposed chamberopening through the side walls and a slot communicating with the chamberand opening through the rear end wall, said chamber forming a receptaclefor a coil of coated abrasive strip, said rear end wall having atransverse channel below the slotand the top wall having a transversechannel adjacent the front end thereof, and means for clamping a stripagainst the bottom wall, comprising a double yoke toggle, one yoke beingpivoted directly to the side walls on a fixed axis for forward anddownward swinging movement of its head into the top wall channel and theother yoke being pivoted directly to the legs of the first yoke, aheadof its fulcrum, for forward longitudinal movement of its head into therear wall channel upon said movement of the first yoke.

8. A hand sander comprising a block havingv bottom, top, side, front,and rear end walls, the block being shaped to provide a transverselydisposed chamber opening through the side walls and a slot communicatingwith the chamber and opening through the rear end wall, said chamberforming a receptacle for a coil of coated abrasive strip, said rear endwall having a transverse channel below the slot and the top wall havinga transverse channel adjacent the front end thereof, and means forclamping a strip against the bottom wall, comprising a double yoketoggle, one yoke being pivoted on a fixed axis to the side wall forforward and downward swinging movement of its head into the top wallchannel and the other yoke having the free ends of its legs directlypivoted to the first yoke, ahead of its fulcrum, for forwardlongitudinal movement of its head into the rear wall channel upon saidmovement of the first yoke, the toggle being movable past dead centerfor locking and the second yoke being resilient to permit such movementand to hold the yokes in locked position under spring tension.

9. A hand sander comprising a block having bottom, top, side, front, andrear end walls, the block being shaped to provide a transverselydisposed chamber opening through the side walls and a slot communicatingwith the chamber and opening through the rear end wall, said chamberforming a receptacle for a coil of coated abrasive strip, said rear endwall having a transverse channel below the slot and the top wall havinga transverse channel adjacent the front end thereof, and means forclamping a strip against the bottom wall, comprising a double yoketoggle, one yoke being pivoted to the side wall for forward and downwardswinging movement of its head into the top wall channel and the otheryoke being pivoted to the first yoke, ahead of its fulcrum, for forwardlongitudinal movement of its head into the rear wall channel upon saidmovement of the first yoke, the first yoke including closure plateextensions, movable upwardly upon downwardly swinging movement of 7 theyoke to else-e the side wan eiseihil'ge of said chamber.

10. A sander in accordance with claim 7 char ac'terized in that the headof the first mentioned yoke includes an iipwardly and forwardlyprojecting finger-piece plate; adapted to receive pressure from the handof the user to maintain the yoke in clamping relation and to transmitforce to the work.

11. A sander in accordance with claim '7 char acter'ized in that thefirst mentioned yoke comprises a strip of sheet metal bent to U-shape,with its legs disposed in parallel relation to the side walls of theblock and having rearward e'xtensions adapted to close the ends of thechamber.

12. A hand sander comprising a block having Bottom; top, side, front andrear walls, the rear wall having a transverse channel therein and thetop "wen having an upwardly opening, vertically disposed transversechannel adjacent the front end thereof, and means for clamping a stripof abrasive material in said channels and against the bottom wall of theblock, said means comprising a double yoke toggle, one yoke b'ein'gpi'voted to the side walls for forward and downward swinging movementand having a blade-like head arranged to swing substantially verticallyinto the top wall slot, to force the strip thereinto and to applytension thereto, the other yoke having 30 l lunfibe r the free ends ofits legs directly pivoted to the firstyblee aheaa or its fulcrum forforward lon glti'i'di'nal movement of its head into the rear wailehafmel upon said movement of the first yoke, to clamp thestri'ptherein.

13. A sander in accordance with clain'i 12 characterized in that thehead of the first men tioned yoke includes 'a forwardly and upwardlyprojecting extension adapted to serve as a finger piece, to receivepressure from the hand of the user-and to m'aihtain saidhead in t slot.

i r g arrrqnn. STENBERG.

. MILTON 'IMMERMANN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS 2'0 Number I Name Date izsjess 'Gerne'z Feb. '20,1872 342,579 Peter's -e Jan. 29, 1907 1520299 Wilson Oct. 28, 1''9'1'91,945,562 Wur'fschmidt Feb. 13, 1934 25 1,947,054 McReynoms Feb. 13,1934 2,235,874 Ross June 9, 1942 2,446,625 Anderson Aug. 10, 1948FOREIGN PATENTS Country Date 234,501 Great Britain July -1, 1926

